Primary Weapons Systems Mk107 Mod1 Upper 223 Wylde 7.75in Triad556

The Primary Weapons Systems MK107 Mod 1-M upper, also known as The Diablo, blends PWS's renowned long-stroke piston system with a compact 7.75-inch barrel chambered in 223 Wylde for versatile performance across .223 and 5.56 NATO ammunition. This shortest option in the MK1 Mod 1-M line delivers a precise 1:8 twist and a lightweight package that weighs just 3 lb 8 oz with a length of 17 inches, making it an ideal patrol rifle or duty upper for rapid response and close-quarters engagement. Built on fully forged upper and lower receivers, the system features a three-setting adjustable gas control, a forward assist, and a free-float M-LOK handguard for flexible accessory mounting, while the Triad556 compensator helps manage recoil and muzzle rise for quicker follow-up shots. The rugged Radian Raptor charging handle, combined with the proven PWS long-stroke piston operating system, provides reliable cycling and durability in demanding environments. This MK107 MOD 1-M is designed to meet high-value, no-nonsense requirements for law enforcement and civilian shooters alike, offering a proven platform that is relentless and unstoppable when you need it most, with included rifle service tool, PWS sticker, and manual for quick field maintenance and setup.